A continual zoom system with high speed and visible wavelength range is designed. The lens has the
advantages of high etendue and telecentricity in image space. It can be used properly as the fore objective of
imaging spectrometers with high resolution since its image size doesn't change with the defocus of detector
plane and its illumination in the plane is rather uniform. According to the characteristics and performance of
the optical system of our hyperspectral imager, the structural selection and the initial parameter calculation
are introduced in detail. The designed optical system with mechanical compensation is presented. The zoom
ratio of the lens is 4 and the relative aperture 1:2. Its effective focal length is 55mm at short focus end and
220mm at long focus end. Its field angle is from 2 degrees to 8 degrees. Its distortion is lower than 0.6 per
cent. The MTF value at the spatial frequency of 35lp/mm is higher than 0.77. The evaluation of its image
quality shows that the designed zoom system can meet the requirements of our hyperspectral imager as its
fore objective.
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